Fluid-pressure motor



No.7609,625. Patented Aug. 23, |898. P. C. N. PEDERSON.

FLUID PRESSURE MOTOR.

(Application led July 29, 1897.)

No. 609,625. Patented Aug. 23, |898.

P. C. N. PEDERSON. FLUID PRESSURE MOTOR.

(Application led July 29, 1897.)

(No Model.)

- lIlII Nrrnn STATES PATENT OFFICE.

i PETTER C. N. PEDERSON, OF WESTSUPERIOR, WISCONSIN.

FLUID-PRESSURE MOTOR.

SPECIFICATION forming part of LettersPatent No. 609,625, dated August 23, 1898. Application tiled July 29, 1897. Serial No. 646,394. (No model.)

To CLZZ whom t may cm1/cern:

Be it known that I, PETTER C. N. PnDERsoN, a citizen of the United States, residing at West Superior, in the county of Douglass and State of Wisconsin, have invented a new and useful Fluid-Pressure Motor, of which the following is a specification.

My invention relates to fluid-pressure motors adapted to utilize the expansive force of steam, compressed air, gas, or any equivalent fluid g and the object in view is to provide improved means in connection with a construction of the class shown and described in my former application, Serial No. 623,854, tiled February 1S, 1897, whereby the successive entrance of the piston-heads into the expansion-chamber is facilitated and whereby the frictional contact of the parts involved by such entrance is reduced to the minimum, and, furthermore, to provide an improved construction of valve mechanism for admitting and checking the admission of motive agent.

Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claims.

In the drawings, Figure l is a vertical 1ongitudinal section of a portion of a motorconstructed in accordance with my invention, one of the expansion-chambers and contiguous parts being shown in section and another in elevation. Fig. 2 is a horizontal longitudinal section on the line 2 2 of Fig. l. Fig. 3 is a detail view in perspective of one of the expansion-chambers and contiguous parts detached. Fig. 4 is a transverse vertical section of an expansion-chamber, taken in the plane of the gate-axes on the `line 4 4 of Fig. l. Fig. 5 is a transverse sectional View of one of the piston-heads to show the construction of the packing devices. Fig. 6 is a detail view of one of the piston-heads and the contiguous portion of the carrier, partly in section, to show the means whereby the fulcrum or hinge pins are secured against accidental displacement.

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

In the present embodiment of my invention I employ means for actuating the oppositely-locatcd winged gates l of the eXpansion-chambers 2, whereby the shock or jar incident to the direct contact therewith of the piston-heads 3, as shown in my former application above mentioned, is avoided, the general features of construction of the expansionchamber, the gates, the piston-heads, and the endless carrier 4 for the piston-heads being practically identical with the corresponding parts in the said former embodiment of my invention. It will be understood that the carrier traverses a guide 5, which in the construction illustrated consists of a wheel, any suitable number of such guides being employed, according to the length of the carrier and the number of expansion-chambers which may be employed.

The spindles 6 ot' the revoluble winged gates are extended laterally beyond the eX- pansion-chambers and are fitted with spiders 7, each having a plurality of radial projections or arms corresponding in number with the wings of each gate, and the diameters of Y these spiders are such as to arrange the contiguous linearedges in contact with opposite surfaces of a traveler 8, mounted in a suitable guide 9, disposed parallel with and longitudinally of the expansion-chamber. The arms of the spiders 7 have fiat bearing-surfaces 7 for contact, as above indicated, with the opposite surfaces of the traveler 8, whereby under ordinary circumstances said spiders are held from rotation, and thus secure the gates against rotation by the interposition of the traveler, and in order to allow the spiders to rotate, and thereby correspondingly turn the gates to admit a piston-head, I have cut away or recessed the traveler, as shown at 10, at intervals corresponding with the intervals between the piston-heads. Hence when a piston-head approaches the inwardlyprojecting alined wings of the gates the recessed or cut-away portion 10 of the traveler is brought into such position with relation to the spiders on the spindles of such gates as to admit the contiguous arms of the spider, and thereby enable the latter to rotate. It will be seen, furthermore, that after the engagement of the contiguous arms of the spiders with said cut-away portions or recesses of the traveler the linear movement of the traveler will communicate motion to the spiders, and thus cause the rotation of the gates ICO through an arc approximately equal to a quadrant, and hence the traveler may be utilized as a gate-actuating device, provided auxiliary means are employed for tripping the spiders sufficiently to cause the engagement of their rear innermost arms with the traveler, such means being hereinafter fully y described.

The traveler is of flexible construction, as also is the carrier 4, and I have found in practice that an efficient construction of parts for this purpose is a series of hingedly-connected links having their contiguous ends provided with interlocking eyes 4 and 8a, engaged by fulcrum or hinge pins 4b and 8b, said hingepins being secured against accidental displacement by means of locking-pins, of which one is illustrated at 4c in Fig. 6. On the spindle of the guide 5, which may be termed a main or carrier guide, from the fact that it is employed for supporting the pistoncarrier, is arranged an auxiliary or traveler guide 12, preferably corresponding in construction with the carrier-guide and adapted to perform the function of supporting the traveler, which thus moves in a path parallel with and vat a speed corresponding with the carrier. Y

Carried by each spider 7 is a series of tripshoulders 13, consisting of projections from the face of the spider in the path of a calnfaced trip 14 on the contiguous surface of the traveler, and in the construction illustrated these trip-shoulders are formed by the eX- tremities of a trip-head 15, secured to the outer surface of the spider and having its angles arranged at points approximately midway between the arms of the spiders and corresponding in number therewith. The trip- Ashoulders are arranged at such 'distances from the axes of the spiders with relation to the cam-surfaced trips 14 that as the traveler advances in the direction indicated by the arrow in Fig. 3 said trips come in contact with the innermost or contiguous trip-shoulders just as the cut-away portions or recesses 10 of the traveler come into alinement with the rear arms of the spider, and hence impart sufficient movement to the spiders to bring their rear innermost arms into engagement with said recesses, whereupon the spiders are in position to be rotated by the direct application of the pressure of the traveler thereto.

Th us it will be seen that the traveler, which operates parallel with and at a speed corresponding with the carrier, is guided between the contiguous fiat-surfaced portions of the innermost or contiguous arms of the spiders, and hence forms a lock to normally maintain the spiders in such positions as to hold the gates of the expansion-chamber in their operative positions, and that this relative arrangement of parts continues until certain cut-away portions or recesses 10 of the traveler are brought into alinement with the rear arms of the spiders as the piston-heads appreach the inwardly-extending alined wings of the said gates, whereupon trips on the traveler engage certain projections on the spiders, and thereby turn the latter sufficiently to cause the engagement of said rearmost arms with the recesses of the traveler, and thereby cause an interlocking connection between the spiders and the traveler, which is followed immediately by the reversal of the gates and a consequent ad mission of the contiguous piston-head. It will be seen that a piston-head is admitted to an expansion-chamber by the forward movement of the alined inwardlyextending wings of the gates, while the succeeding gates close together behind the piston, thus disposing the parts of the mechanism for the immediate admission of the motive agent between the rear or operative face of the piston-head and the contiguous surfaces of the inwardly-extending alined gatewin gs, which form a fixed abutment and which bear at their edges against the opposite surfaces of the iiexible carrier, as clearly illustrated in Fig. 1.

It will be understood that suitable packing devices are employed upon the peripheral and side edges of the gate-wings to insure a steamtight contact with the contiguous portions of the mechanism, and in practice I prefer to employ packing-strips both on the gate-wings and on the piston heads, which are constructed as shown in detail in Figs. 5 and 6 in connection with the piston-head, wherein the strip is formed of angular sections 16, disposed, respectively, at the several angles of the member to be packed, and each strip consisting of arms 16a, pivotally connected, as at 17, and outwardly impelled by means of actuating-springs 18. The contiguous extremities of the pivotal arms 16a of the angular strips are reduced to form interlocking sliding projections 19, and the motive agent is prevented from escaping through the intervalsformed bythe extension of the packingstrip members by means of guard-plates 20, which are arranged in contact with the inner surfaces of said contiguous interlocking cX- tremities of the arms 16a. Any suitable means for preventing the outward displacement of thepacking-strip members may be employed, such as stop-pins 2l, engaging suitable slots 22. l i

The advantage of the pivotally-connected arms of the angular packing-strips resides in the fact that in case of a slight lateral tilting of the carrier or a slightly-inclined surface produced by the wearing of the cooperating parts the packing-strip will be enabled to tilt to snugly fit said surfaces. For instance, if a packing-strip comes in contact with a laterally-inclined surface the arm which is approximately parallel with said surface will adapt itself `accurately to the inclination thereof, while the pivotally-connected arm will simply move in a direct path perpendicular to the normal position of the first-named arm. If a rigid joint is used between the arms of the angular strip, one arm cannot tilt IOO IOS

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` without the other, Whereas with the pivotal construction specified one of' the arms may tilt Without affecting the other to suit a laterally-inclined surface in contact with which it may be disposed.

The valve mechanism which I have found to be efficient in connection With the construction as above set forth embodies a rotary valve 23, controlling an inlet-port 24e-in the Wall of the expansion-chamber contiguous to the plane of the inwardly-extending alined gate-Wings, and a reversing-bar 25, provided With a rack 26, engaging a mutilated gear 27 on the stem of said valve, said reversing-bar being mounted in suitable guides 28. Connecting with this reversing-bar are oppositely-extcnding trip-arms 29 and 30, which in the construction illustrated consist of bellcrank levers, having one arm connected to said reversing-bar and the other arranged in the path of one of the cam-faced trips 14. After the trips have performed their function in causing the engagement of the arms of the spiders with the traveler one of them just as the reversal of the gates is accomplished comes in contact with the trip-arm 29 and moves the reversing-bar in the direction indicated by the arrows in Figs. l and 2, thus opening the valve for the admission of steam. When said trip reaches the oppositely-positioned or reversing trip-arm 30, the reversingbar is again returned to its initial position (indicated in said Figs. l and 2) to close the inlet-valve. Thus the inlet-valve is closed before the piston, which has been exposed to the pressure of the motive agent, leaves the outlet end of the expansion-chamber, and may be closed at any intermediate point of the travel of the piston-head in order to utilize the expansion of the motive agent to the desired extent. It will be understood, furthermore, that the piston-heads and carrier are relieved of all jar incident to the entrance of the former into the expansion-chambers, and the opening of the gates by the means provided is accomplished With certainty and by pressure applied to the spider-arms at pointslocated at a distance from the axis of the gates equal to the radii thereof.

The mechanism is described as preferably inclosedin a casing 3l, into Which the eXpansion-chambers are adapted to exhaust, the motive agent being conveyed to the valvecasing by means of a supply-pipe 32 and being allowed to escape from theinterior of said casing through an exhaust-port 33.

Various changes in the form, proportion, and the minor details of construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of this invention.

Having described my invention, what I claim isl. A Huid-pressure motor having an eXpansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion -chambelg a traveler located eXteriorly of the expansionwhereby the latter are reversed successively as they are approached by the piston-heads, substantially as specified.

2. A fluid-pressure motor having an expansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber, atraveler operatively connected with the piston for coincidental movement, and spiders carried by the gates and having their arms arranged in the paths of engaging devices on the traveler, substantially as specified.

3. A fluid-pressure motor having an eXpansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber, a traveler mounted for linear movement and operatively connected with the piston, spiders on the gates having bearing-surfaces to engage the traveler and prevent accidental movement of the gates, and means for periodically connecting the spiders with the traveler to reverse the gates, substantially as specified.

4:. A fluid-pressure motor having an expansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber, a traveler mounted for linear movement and operatively connected with the piston, spiders carried by the gates and having arms to engage spaced recesses in the traveler, and 'trip devices for actuating the spiders to cause engagement of their arms With the recesses of the traveler, substantially as specified.

5. A fluid-pressure motor having an eXpansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber, a traveler mounted for linear movement parallel with the piston, spiders carried by the gates and having arms for successive engagement by the traveler, and cam-faced trips on the traveler for engaging projections on the spiders, to cause engagement of the arms of the latter With the traveler, substantially as specified.

6. A Huid-pressure motor having an eXpansion-chamber, a piston having an endless carrier and a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber in a common direction, rotary Winged gates in the expansion-chamber, an endless traveler operatively connected with the piston for continuous movement in a uniform direction, armed spiders carried by the spindles of the gates and having fiat bearing-surfaces normally in contact With opposite surfaces of the traveler, said traveler having recesses to engage the arms of the spiders, and cam-faced trips on the traveler for successively engaging trip-shoulders located on the spiders between the arms thereof, substantially as specified.

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7. A fluid-pressure motor having an expansion-chamber, a piston having a plurality of spaced piston-heads adapted to pass successively through the expansion-chamber in a common direction, gates located at the inlet end of the expansion chamber, a traveler mounted for movement parallel With the piston, and valve mechanism for admitting motive agent to the expansion chamber, said mechanism including trip-arms located in the path of trips carried by said traveler, substantially as specified.

8. A uuid-pressure motor having an expansion-chamber, a piston having a pluralityof spaced heads adapted to pass successively through the expansion-chamber in a common direction, gates for closing the inlet en'd of the expansion chamber, valve mechanism having a reversing-bar operatively connected With the controlling-valve, and trip-arms connected With the reversing-bar, and a traveler mounted for movement parallel with the piston and having cam-faced trips for successive engagement With the trip-arms to alternately open and close the controlling-valve, substantially as speciiied.

9. A {luid-pressure motor having an expansion-chamber, a piston having a plurality of spaced heads adapted to pass successively through the expansion-chamber in a common direction, gates arranged at the inlet end ot' the expansion-chamber and provided with exterior spiders, valve mechanism including oppositely-located trip-arms operatively connected with the controllingvalve,and adapted to be successively operated to open and close said valve, atraveler mounted for movement parallel With the piston and provided with means for engaging the arms of said spiders on the gates, and cam-faced trips for successively engaging projections on the spiders and said trip-arms, substantially as specified.

l0. A fluid-pressure motor having an expansion-chamber,valve mechanism, and a pistonhead to operate in the expansion-chamber, said piston-head being provided with packing devices consisting of angularterminallyinterlocking packing-strips,each having arms pivotally connected at the angle formed thereby, and means for yieldingly holding said strips in their extended posit-ions, substantially as specified.

ll. A fluid-pressure motor having an expansion-chamber,valve mechanism, and a pistonhead to operate in the expansion-chamber, said piston-head being provided With packing-devices consisting of angular terminallyinterlocking strips, flat guard-plates spanning the interlocking extremities of the contiguous strips at their inner surfaces and attached to the extremity of one of them, and means for yieldingly holding the strips extended, substantially as specied.

l2. Aiiuid-pressure motorhavingan expansion-chamber, gates for closing the inlet end of the expansion-chamber, and valve mechanism, in combination with a piston having a iexible carrier, and a plurality of pistonheads adapted to pass successively through the expansion-chamber, said carrier consisting of hingedly-connected sections provided at their contiguous extremities with interlocking eyes, fulcrum-pins engaging the interlocking eyes, and locking-pins transversely engaging said fulcrum-pins to secure them against accidental displacement and this is held in place by the abutting ends of contiguous carrier-sections, substantially as specied.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two Witnesses.

PETTER C. N. PEDERSON.

Witnesses:

ETHEL DAvIs, A.V E. SIMMONS. 

